Abstract: Aiming at the disadvantages of the existing wireless meter reading system with high power consumption, short transmission distance and low reliability, a new wireless meter reading system is designed. The system takes the ultra low power STM8 serials microprocessor as the core, Contiki for the embedded operating system, and uses LoRa communication technology and custom network communication protocol, realizes the flow data acquisition and remote management of ultrasonic water meter, which meets the demand of the low cost and high efficiency meter reading. The final tests indicate that the system has good performance in terms of power consumption, transmission distance, reliability of data transmission and building network.